Reference

The label on a machine and the sign on the wall share signal words and colours but belong to different standards, with different owners and different replacement duties. This guide contrasts ANSI Z535.4 and Z535.2 point by point, then walks the relabelling of a rebuilt machine whose original label set was lost to paint.

Lockout/tagout is the OSHA-mandated procedure that keeps machines from starting while a worker is inside the danger zone. This guide walks through the six-step 1910.147 energy-control sequence in order, decodes the six hazardous energy types and how to isolate each, and covers group lockout, shift change, and lock-removal rules.